Mechanical drier.



Patented July 28, 1914.

INVENTOR I I I 1 1/ WITNESSES.

ED STATES PATENT OFFICE.

WILLIAM E. P BIN'DIIE, OF MANITClWOC, WISCONSIN.

MECHANICAL DRIER.

To all whom it may concerh 1 Be it known that 1, WILLIAM E. Parsons, a citizen of the United States, and a resident of Manitowoc, in the county of Mani towoc and State of Wisconsin, have invented certain new and useful Improvements in Mechanical Driers, of which the following is a specification.

My invention relates generally to driers, and has reference more particularly to improvements in rotary driers adapted for use in drying wet materiaL- It has for one of its principal objects to provlde an improved drier wherein high temperatures are effectively employed and applied to the wet and cold'material as it first enters the drier, correspondingly reduced temperatures to material which is partially dried out, and low temperatures at a low velocity to ma terial which has approximately reached the finished and dried stage. Another object of my invention is the provision of a valvular means adapted to regulate the temperature at the discharge end of the drier, and to further permit the rapid cooling of the drier when necessary. My invention further contemplates the provision in a drier of an inner heat conducting conduit ported at intervals for the flow of heat therethrough into the drier shell, and wherein the ports are provided with a novel construction and arrangement of hood designed to positively prevent material from working into the conduit.

These together with such other objects as may hereinafter appear ll attain by means of a construction illustrated 1n preferred form in the accompanying drawings, wherein Figure 1 is a longitudinal sectional view of my improved apparatus, the cylinders being shown broken away, in order to reduce the size of the figure;

Figure 2 is a front end elevation of Figure 1. I

Figure 3 is a sectional view on the line H-II of Figure 1. I

Figure 4 is a rear end elevation of Figure 1.

Figure 5 is an enlarged detail of Figure 1' showing the rear end of the inner cvlinder. a

In carrying out my invention as illustrated in the preferred construct-ion disclosed in the drawings I provide a suitable Specification of Letters Patent. Application filed February 28, 1912. Serial No. 680,464.

Patented July 28, 1914.

base or foundation 5, upon which the drying cylinder 6 is mounted for rotation and which preferably lies at an angle to the horizontal. At suitable distances along the length of the cylinder are tires 7 which are bolted to the outside of the drying cylinder 6. These tires have peripheral engagement with rollers 8 suitably mounted for movement on the base Thrustrollers 9 contact with the vertical shoulders of the tires and thus prevent any longitudinal creeping. The rear or discharge end of the cylinder is provided with a hood or end portion 10, the cylinder freely rotating in bearings therein, the flanged ring 11 bearing against the angular flange portion 12 of the hood 10. While this arrangement also tends to prevent any longitudinal sliding of the dry- 1ng cylinder, but little or no friction is present inasmuch as the thrust rollers amply compensate for creeping.

p The hood 10 is securely mounted on the base 13 and is further provided with the braceslO which are bolted at one end to the hood 10 and at the other end to the base 13. At the lower portion of this hood 10 is a flue or discharge pipe 14 leading from the discharge end of the cylinder to a' receptacle 15 within which is provided a worm conveyer 15 for conveying the dried material to any suitable depository- A door 16 is provided in the hood providing ready access to the receptacle 15 so that in case of any clogging an inspection of the parts may be had at any time. By a reference to Figure 4, it will be seen that I have provided openings 10 in the central portion of the hood 10 for the purpose of admitting a supply of cold air to the cylinder. The size of the openings or their closures are regulated by means of the perforated disk 10".

Thefront end of the cylinder 6 registers with a bonnet 17 and communicates therewith through the opening 18. The frustoconicalforward end of the cylipder 6 is provided with an internal annular flange 19, which, when the cylinder is given rotary movement, revolves about the marginal rim of the vapor bonnet, a bearing surface being provided by the annular flange 2O periphera-lly formed on the bonnet. The bonnet 17 is stationary and. is adjustably supported upon a frame orstandard 21.

Extending longitudinally throughout the length of the dryingcylinder is an inner settle here and be subject to combustion.

The forward end of the hot air chamber 22 which projects through the vapor bonnet fits slidably over a' collar 18 which is bolted to an extension 25 leading from the temparing chamber 26. Upon the top of the tempering chamber is secured an exhaust fan 27, which communicates with the vapor bonnet 17 by the suction pipe or funnel 27.

The hot air tube' 22 is suspended within.

the drying chamber at the lower end by means of the spider 28, and at the front end of the chamber by means of the flexible link members 24 secured at one end to the tube and at the other end to brackets as-in the manner shown. This flexible connection allows forany expansion or contraction of the tube. It will readily beseen that the inner cylinder or tube rotates with the outer or drying cylinder.

At intervals along the length of the hot air chamber 22 are outlets or openings 30 which are protected by the elongated hoods 31. The arrangement of these hoods is such that the heated air entering the hot air tube from the tempering chamber passes through the hoods and comes directly in contact with the material to be dried, a constant circulation of heated air being maintained by means of the fan suction apparatus.

The wet material is fed into the drying chamber through a spout 32 which projects through the vapor bonnet into and at one side of the drying chamber 6.

The drying chamber 6 is rotated by means of the gear 34 which is bolted on the outside of the drier and meshes with a pinion 48 driven by any source of power or connections therefrom.

,Asthe drier revolves the tube 22 is revolved with it and the material is cascaded by means of the Z lifting blades 35 bolted in the inside of the drying chamber 6, and the lifting blades 36 bolted to the outside of the hot air cylinder 22.

Referring now particularly to Figures 1, 3 and 5 it will be seen that the rear end of .theinner cylinder 22 is provided with a perforated head 49 having concentric openings 43. The purpose of these openings is to discharge any material which may have worked into the-cylinder through the o enings 30.

A larger opening 44 is situated in the head This arrangement keeps this partie 'ular space around'the hot air cylinder clear ofany light particles which might otherwise which is opened-or closed by the valve disk 45 carried by the rod 46. The rod 46 rests for free longitudinal movement on the support '47 within the cylinder 22. By operating the disk 10" and opening the valve 45 the entire drier can be cooled down at once, as the exhaust fan draws the cool air in through the openings 10 into both cylinders 22 and 6, or conversely, by the closing the valve more of the heated ases can be drawn to the discharge end of t edrier, increasing the temperature, which may also be further increased by the closing of the disk 10. Varying temperatures at the rear end of the drier can thus be obtained by opening and closing the valve 45 and by manipulating the regulating disk 10.

The operation of the apparatus is substantially as follows: The wet material is fed into the front end of the drying cylinder 6. The suction means draw the heated gases from the tempering chamber 26 through the front end of the inner cylinder 22 and then through the outlets into the drying chamber, coming into directcontact with the material. As the drier rotates the material is lifted and cascaded, first by the lifting blade on the outer shell, and then by the lifting blades on the inner cylinder, the heated gases thus having full access to the material. The valve 45 is normally held closed on its seat, and by means of the exhaust a supply of heated gases can be drawn to the discharge end of the drier through those openings 30 formed in the rear end of the cylinder; and it will be obvious that moving the valve to its open end acts to break and reduce this induced flow through these openings, consequently decreasing the temperature at the rear end of the drier. As previously indicated, a further decrease of temperature may be obtained by manipulating the disk 10*.

The material at its wettest sta e comes into contact with the gases at their ighest temperatures, which 'ass through the outlets in the front end of t e inner cylinder 22. Then as the material gradually works rearward and is constantly parting with its moisture, it comes into contact with gases of diminishing temperature until it is finally discharged amid gases of a ve low temperature moving at a very low ve ocity. At this stage the material is dry and consequently light particles are not scorched or drawn out by the suction fan as the velocity becomes practically negligible at the rear end. The material then gravitates into the receptacle 15, and is then carried away by the conveyer 15'.

The shell of the drier is preferably welded up entirely; the heads, tires, lifting blades and ring only being riveted in place. By using this construction no places are left which might collect any acid contained in the material and attack the metal parts.

Having thus described my invention and amines illustrated its usewhat I claim as new and.

desire to secure by Letters Patent is the fol lowing 1. In a mechanical drier, the combination of .a drying cylinder having .a feed member at its forward end and a discharge opening at its rear end, an inner hot air tube suspended within and rotatable with the drying cylinder and provided with an opening at its forward end leading to a source of heat, and draft outlet openings arranged at inter, vags lengthwise in the walls of the hot air tu e.,

2. In a rotatable drier, the combination of an outer drying cylinder havinga feed means at its forward endanda discharge outlet at its rear end, an inner tube suspendedwithin the outer cylinder and adapted to have slight longitudinal movement therein said inner cylinder being provided with outlets in its walls communicating with the outer cylinder, and hoods forthe said outlet open- 111 s.,

In a drier the combination of an outer drying'cylinder, an inner hot air flue pro vided with outlet openings therein communieating with the' outer cylinder, said inner flue being provided with an inlet opening at its forward end and an'air valve in the inner flue, substantially as described.

.4. In a drier the combination of an outer drying cylinder, an inner hot air cylinder, having outlet openings therein and provided with an inlet opening at its forward end, an air valve in the inner cylinder and lifting blades on the inside of the drying cylinder,

substantially as described.

5. In a drier, the combination of an outer drying cylinder, an inner cylinder provided with a hot air inlet at its forward end, u hood at the rear end of thedrier having a discharge outlet and provided with air inlet openings therein and a valve in the drier.

6. In a drier having a welded outer shell, the combination of a rotatable inner cylinder having an openin therein communicating with the outer she l, and a valve governing the said communicating openin 7 Ina drying apparatus, the combination of an outer shell having a discharge opening, an inner tubular member for conducting heated air, said member being disposed within the outer shell and provided withan out-- let in its' wall communicating with the said.

outer shell, the end of the inner tubular member adjacent the discharge end of the drier being open, and a valvular device for opening and closing the said open end of the tubular member, substantially as and for the purpose set forth.

8. In a drier, the combination of an outer shell having an exhaust member, an inner tubular hot air conductor communicating at one end with a suitable source of heat and having its other end open, the wall of the 9. In a drier, thecombination of an outer shell having a feed opening at its front .end and a dlsoharge outlet at its rear end, an inner hot air tube suspended within the outer shell and provided with an opening at one end communicati with a source 'of heat, said inner tube having outlets in its wall providing communication with the outer shell, a stationary bearing or hood inclosing the rear end of the drier, and regulating means in the hood whereby the admission of cool air into the drier is controlled as in the manner set forth.

' 10. In a drier the combination of an outer shell, a bonnet opening into and communicating with the outer shell, a cylindrical conductor mounted in the bonnet for the passage of hot air or gases to the outer shell, segmental packing means in the bonnet arranged around the conductor, and exhaust means leading to the outer shell.

11 Ina mechanical drier; the combination of an outer cylinder having a feed member at one end and a discharge opening at the other end, a cylindrical conductor for the passage of air or gases suspended in the outer cylinder and having an air inlet opening at its forward end, said conductor being further provided with an outlet opening in its walls communicating with the outer cylinder,.and a rearwardly projecting hood-fitting around and protecting the said outlet opening substantially as described.

12. In a drying apparatus,'-the combination of a drying shell provided with a feed opening and a discharge outlet, a furnace chamber, a connection between the furnace chamber and thedryin shell, the drying shell being provided wi an inlet opening at its rear end, and a valve mounted in the shell adjacent to and controlling the air inlet opening. a i

.13. In a rotary drier, the combination of an outer shell having a feed member at its forward end and a discharge outlet at its rear end, an inner cylinder suspended within the said outer shell having an opening at one of its ends leading to a source of heat and provided with a draft outlet in its walls communicating with the outer shell, and an elongated hood on the inner cylinder prosource of heat adjacent its forward end and having a plurality of hooded draft outlet openings arranged at intervals lengthw1se in the walls of the tube.

15. In a rotatable drier, the combination of a drying shell having feed means adjacent its forward end and a discharge opening adjacent its rear end, a hot air tube mounted within the shell communicating with a source of heat adjacent its forward end and having a plurality of draft outlet openings arranged atintervals lengthwise in the walls of the tube, and hoods for said outlet openings.

16. In a rotatable drier, thecombination of a drying shell having a feed opening adjacent its forward end and a discharge opening adjacent its rear end, a hot air tube mounted in the shell and connected at its front end with a source of heat, said tube having a plurality of draft out-let openings arranged at intervals lengthwise of the tube and formed in its wall, and hoods covering said outlet openings and preventing the material to be dried from working into the tube.

17. In a mechanical drier the combination of a drying shell having feed means adjacent its forward end and a discharge opening adjacent its rear end, a hot air tube mounted within the shell communicating with a source of heat adjacent one end and having a lateral draft outlet opening formed in its walls intermediate the ends thereof and a rearwardly projecting hood for the draft outlet opening.

18. In a mechanical drier the combination of a drying shell having feed means adjace t its forward end and a discharge opening adjacent its rear end, and a hot air tube mounted within the shell communicatin with a source of heat adjacent one end an having a lateral draft outlet opening formed in its walls intermediate the ends thereof whereby a current of hot air flows from the tube into the shell, and an exhaust means adjacent the forward end of the shell creating a flow of air from the shell.

19. In a mechanical drier the combination of a drying shell havin feed means adjacent its forward end and a discharge opening adjacent its rear end, and a hot air tube mounted Within the shell communicating with a source of heat adjacent its front end and having a plurality of draft outlet openings arranged at intervalslengthwise in the walls of the tube, and an exhaust means adjacent an end of the shell creating a flow of air from the shell. I I

20. In a rotatable drier, the combination of an outer drying cylinder having feed and exhaust members at its forward end and-a discharge outlet at its rear end, an inner cylinder suspended within the outer cylinder and adapted to have communication at its front end with a source of heat, said inner cylinder being provided with outlets in its walls communicatin with the outer cylinder, and hoods for t e said outlet openings.

21. In a mechanical drier the combination of an outer drying shell, an inner hot air tube communicatin adjacent one end with a source of heat andopen adjacent the other end to the shell and having an outlet opening in its walls establishing communication with the shell, and a valvular device for controlling temperature conditions inthe drier and capable of actuation to open and close the said open end of the tube.

22. In a drier the combination of an outer drying shell, having a closed rear end, said closed rear end being provided with means adapted for the admission of cold air, an inner hot air tube communicating at its forward end with a source of heat and open adjacent its rear end, a valvular device for controlling the admission of air at said open rear end, and means for inducing a flow of air through the shell and tube.

23. In a drier the combination of an outer drying shell, an inner hot air tube communicating at its forward end with a source of heat and open adjacent its rear end and having an outlet opening intermediate its ends establishing communication with the shell, a

valvular. device for controlling the admission of air at said rear end, and means at the forward end of the shell for inducing a flow of air through the shell and tube.

24. In a mechanical drier the combination of a drying shell having a feed opening and a discharge opening, and a hot air tube within the shell having a fixed mount-ing in the shell adjacent one end and mounted for longitudinal movement relative to the shell adjacent the other end. i

25. In a mechanical drier the combination of a drying shell having a feed opening and an air inlet opening, a hot air tube within the shell communicating at one end with a source of heat and having its other end dis posed adjacent the said air inlet opening, and valvular means cooperating wlth the said air inlet opening for controlling temperature conditions in the drier,

26. In a mechanical drier the combination of an outer shell having a feed opening at 116 its forward and a discharge opening at its rear end, a feed member at the forward end of the shell and an inner hot air tube mounted in the shell openin to a source of heat at its forward end an having a plurality 120 of lateral outlet 0 enings in its walls whereby the material in the shell in its wettest stage is subjected to hot gases at their highest temperature and to decreasing temperatures as it progresses toward the discharge end of the shell.

27 In a mechanical drier the combination of an outer shell having a feed opening at its forward and a discharge opening at its rear end, and an inner hot air tube mounted 30 in the shell opening to a source of heat at itsforward end and having a plurality of hooded lateral outlet openin in its walls whereby the material inthe s ell in its wettest stage is subjected to hot, gases at their highest temperature and to decreasing temperatures as it progresses toward the discharge end of the shell, and means for in dlucing a flow of the hot gases from the s ell.

28. In a mechanical drier having an outer shell and an inner tube communicating with a source of heat at one end and to the shell at the other end, the combination of a breeching or hood inclosin the rear end of the drier and provided wit an opening for the admission of cold air, andan air valve in the tube for cont-rolling the. admission of cold air therein.

29. In a mechanical drier having an outer shell and an inner tube communicating. with a source of heat at one end, the combination of a breeching or hood inclosin the rear end of the drier and provided wit an opening for the admission of cold air, and an air valve in the tube for controlling the admission of cold air therein, and regulating means for controlling the admission of air through the opening in the breeching.

30. In a rotary drier, the combination of a shell adapted toreceive the material to be dried and' having a feed openin at its for: ward end, and means whereby t e material is subjected to low temperatures adjacent stantially as described.

In testimony whereof, I have hereunto signed 111 name in the presence of the two subscribe witnesses;

WILLIAM E. PRINDLE.

Witnesses:

-W. HERBERT FOWKES, M. H;'EmoKsoN.. 

